NTC thermistor has the characteristics of high temperature measurement accuracy and reliability, good interchangeability, and easy implementation of remote measurement and control. It is widely used in voltage regulation, temperature compensation, surge current suppression, temperature detection, and remote control of communication equipment. etc. Therefore, for many years, the design and development of new thermistor materials, composite thermistor materials and high-temperature thermistor materials have been the research hotspot in the field of thermistor materials. The Research Group of Sensitive Materials and Devices of Xinjiang Institute of Physics and Chemistry Technology, Chinese Academy of Sciences has been engaged in the research of thermistor materials for a long time. It has done a lot of research in the exploration of new thermistor materials, material preparation and device design, and has achieved a series of important research results. For the problems of the thermistor material consistency, poor stability, low accuracy, repeatability, resistance drift, etc., the research group's flexible occupation of Mg2 + in the spinel structure is beneficial to suppress the precipitation of the second phase in the material. To enhance the aging stability of the material, by doping Mg in the Mn-Ni-Co-O ternary system, the resistance drift of the material is reduced, and the thermistor has good thermal stability. Relevant research results are titled Effect of Mg substitution on microstructure and electrical properties of Mn1.25 Ni0.75Co1.0−xMgxO4 (0≤ x≤ 1) NTC ceramics, published in Journal of Materials Science: Materials in Electronics (2012,23 : 851-857). The combination of spinel structure and perovskite structure materials can achieve excellent electrical characteristics that can not be obtained by single-phase structure materials. The research team of the research team used perovskite structure LaMnO3 materials with high conductivity and chose Ca2 + with a relatively close radius of La3 + is substituted at the A site, and then it is compounded with the spinel phase NiMn2O4 material with higher sensitivity. By adjusting the content of Ca and the mass ratio of perovskite-spinel phase materials, a combination with a relatively small Ï25 (<10Ωcm) and a large B value (> 2600K) can be obtained, which is expected to be used as an NTC heat suppressing inrush current Varistor. Related research results are published in the Journal of Materials Science: Materials in Electronics, titled Effect of CaO-doped in NiMn2O4-LaMnO3 composite ceramics on microstructure and electrical properties. The research and development of new high-temperature thermistor materials has always been a hot spot in the field of thermistor research. Rare earth oxides are mostly high-temperature stable materials with high resistance phase, and composite materials formed of rare earth oxides and perovskite-type materials have good stability in high temperature and reducing atmosphere environments. Researcher Chang Aimin led his team to use Y2O3, CeO2 and YCr0.5Mn0.5O3 composite, and found that the material series has excellent high temperature resistance. After the complex impedance analysis of the composite material, it was found that its resistance decreases with increasing temperature mainly from the reduction of the grain boundary resistance; its micro-conductance study found that the relaxation behavior of the grain boundary and the grain boundary conductivity are caused by different defects , The relaxation behavior may be caused by the relaxation mechanism of space charge, and the grain boundary conductance is caused by the oxygen vacancy of the material. Related research results are titled Complex impedance analysis of (Y2O3 + CeO2) –YCr0.5Mn0.5O3 composite NTC ceramics, published in Journal of Alloys and Compounds (2012, 512: 132-139). The preparation process of NTC thermistor powder materials has been widely studied as a method to improve the performance of thermistor ceramic materials. The research group prepared Fe-doped Ni0.9Co0.8Mn1.3-xFexO4 thermistor powder by co-precipitation method, and characterized the material by DT / TGA, XRD, FTIR, SEM, electrical properties and impedance analyzer And test. Studies have shown that resistivity and B value can be adjusted by the content of Fe, which is expected to be used as a thermistor material in a wide temperature range. Related research results are titled Preparation and characterization of Fe3 + -doped Ni0.9Co0.8Mn1.3−xFexO4 (0≤x≤0.7) negative temperature coefficient ceramic materials, published in Microelectronic Engineering (2011, 88: 2934-2940). Bespoke Fabric Sofas,Custom Fabric Couch,Custom Fabric Sectional Sofa,Custom Fabric Reclining Sofa GuangDong Gelunya Furniture Manufacturing Co.,Ltd , https://www.gelunyafs.com
A series of progress has been made in the research of NTC thermistor materials of Xinjiang Institute of Physics and Chemistry, Chinese Academy of Sciences